remove default impl

frame/support/src/traits/dispatch.rs

@@ -45,9 +45,7 @@ pub trait EnsureOrigin<OuterOrigin> {
 	///
 	/// ** Should be used for benchmarking only!!! **
 	#[cfg(feature = "runtime-benchmarks")]
-	fn try_successful_origin() -> Result<OuterOrigin, ()> {
-		unimplemented!()
-	}
+	fn try_successful_origin() -> Result<OuterOrigin, ()>;
 }
 
 /// [`EnsureOrigin`] implementation that always fails.
@@ -165,9 +163,7 @@ pub trait EnsureOriginWithArg<OuterOrigin, Argument> {
 	///
 	/// ** Should be used for benchmarking only!!! **
 	#[cfg(feature = "runtime-benchmarks")]
-	fn try_successful_origin(_a: &Argument) -> Result<OuterOrigin, ()> {
-		unimplemented!()
-	}
+	fn try_successful_origin(a: &Argument) -> Result<OuterOrigin, ()>;
 }
 
 pub struct AsEnsureOriginWithArg<EO>(sp_std::marker::PhantomData<EO>);